Generation of quasi-monoenergetic positron beams in chirped laser fields

TL;DR

This paper proposes a method to generate quasi-monoenergetic electron-positron and gamma-ray beams using chirped laser pulses and high-energy electron beams, enhancing energy precision in particle production.

Contribution

It introduces a novel scheme combining chirped laser pulses with high-energy electron beams to produce narrow energy spread particle beams and gamma rays.

Findings

Chirped laser pulses can narrow the energy spectrum of generated particles.

The proposed scheme produces quasi-monoenergetic gamma-ray and electron-positron beams.

Enhanced control over particle energy distribution in high-intensity laser interactions.

Abstract

High energy photons can decay to electron-positron pairs via the nonlinear Breit-Wheeler process when colliding with an intense laser pulse. The energy spectrum of the produced particles is broadened because of the variation of their effective mass in the course of the laser pulse. Applying a suitable chirp to the laser pulse can narrow the energy distribution of the generated electrons and positrons. We present a scenario where a high-energy electron beam is collided with a chirped laser pulse to generate a beam of quasi-monoenergetic $\gamma$-photons, which then decay in a second chirped, UV pulse to produce a quasi-monoenergetic source of high-energy electrons and positrons.